Part A
AD737JRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7410 PCS
- Package
- SOIC-8
- Series
- Convertisseur PMIC - RMS vers DC
Replacement verdict
Compatible functional replacement candidate
The AD737JRZ and AD737KRZ-RL are functionally equivalent RMS-to-DC converters sharing the same core architecture, pinout, and package family, with the KRZ-RL offering a tighter gain error grade and tape-and-reel packaging. Both are viable substitutes in RMS conversion applications, though the tighter accuracy grade and packaging format of the KRZ-RL should be validated against the target design's tolerance and assembly requirements.
Function and Topology
High match
Package and Pinout
High match
Accuracy Grade
Validation required
Packaging Format
Validation required
Parts at a glance
Part B
AD737KRZ-RL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4092 PCS
- Package
- SOIC-8
- Series
- Convertisseur PMIC - RMS vers DC
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD737JRZ | AD737KRZ-RL | Why it matters |
|---|---|---|---|
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | Package must match for physical board compatibility; both use the same SOIC-8 footprint. |
| Accuracy Grade | J grade (lower accuracy) | K grade (higher accuracy) | The K grade offers tighter accuracy specifications, which directly affects measurement precision in RMS-to-DC conversion. |
| Total Error (Typical) | ±0.5% of reading (J grade) | ±0.3% of reading (K grade) | Lower total error means more accurate true RMS measurements; the K grade is preferable for precision applications. |
| Operating Temperature Range | 0°C to +70°C | 0°C to +70°C | Both are commercial temperature range parts; suitability for the target environment is identical. |
| Supply Voltage Range | ±2.5V to ±16.5V (dual supply) | ±2.5V to ±16.5V (dual supply) | Supply range determines compatibility with the system power rails; both support the same wide dual-supply range. |
| Supply Current | ~160 µA (typical) | ~160 µA (typical) | Low quiescent current is important for battery-powered and low-power instrumentation; both are equivalent. |
| Bandwidth | ~190 kHz (typical) | ~190 kHz (typical) | Bandwidth limits the maximum input frequency for accurate RMS conversion; both parts share the same bandwidth. |
| Output Type | Voltage output (RMS) | Voltage output (RMS) | Output format must match the downstream ADC or signal chain; both provide a buffered voltage output. |
| Packaging / Ordering | Tube / tray | Tape & Reel (RL) | Packaging affects assembly line compatibility; the RL suffix indicates tape-and-reel for automated pick-and-place. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD737JRZ | AD737KRZ-RL |
|---|---|---|
| Part Status | Active | Obsolete |
| Supply Current | 170 µA | 170 µA |
| Voltage - Supply | 2.8V, -3.2V ~ ±16.5V | 2.8V, -3.2V ~ ±16.5V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD737JRZ and AD737KRZ-RL?
Both devices are RMS-to-DC converters from Analog Devices in an 8-lead SOIC package. The primary difference is the specified accuracy grade: the AD737JRZ is the J-grade with a typical total error of 0.5 mV ± 0.5% of reading, while the AD737KRZ-RL is the K-grade with a tighter typical total error of 0.3 mV ± 0.3% of reading. The AD737KRZ-RL is supplied in tape-and-reel packaging, whereas the AD737JRZ is supplied in tube form.
Are the AD737JRZ and AD737KRZ-RL pin-compatible?
Yes. Both parts are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are pin-compatible and share the same PCB land pattern.
Can the AD737KRZ-RL be used as a drop-in replacement for the AD737JRZ?
Yes, in most designs the AD737KRZ-RL can replace the AD737JRZ because they share the same package, pinout, and function. The K-grade offers tighter accuracy specifications, so substituting it for the J-grade is generally acceptable; however, the design should be validated against the datasheet limits for the target grade.
What is the difference in accuracy between the J and K grades?
Per the Analog Devices datasheet, the AD737J (AD737JRZ) has a typical total error of 0.5 mV ± 0.5% of reading, while the AD737K (AD737KRZ-RL) has a typical total error of 0.3 mV ± 0.3% of reading. The K-grade therefore provides tighter accuracy over the same operating conditions.
Do both parts support the same supply voltage and input range?
Yes. Both the AD737JRZ and AD737KRZ-RL operate from a single supply of 2.8 V to 16.5 V or dual supplies of ±2.8 V to ±16.5 V, and both accept the same input signal range and provide the same output scaling, since they are the same base device in different accuracy grades.
What is the difference in packaging between the AD737JRZ and AD737KRZ-RL?
The AD737JRZ is supplied in tube packaging, while the AD737KRZ-RL is supplied in tape-and-reel (the "RL" suffix denotes reel packaging). Both use the same 8-lead SOIC body, so the packaging difference affects handling and assembly feed, not the footprint.
Are the operating temperature ranges the same for both parts?
Yes. Both the AD737JRZ and AD737KRZ-RL are specified over the commercial temperature range of 0°C to 70°C, as defined in the Analog Devices datasheet for the J and K grades.